For example something like the html widget but to be available as a building block so we can add it in the microflow or just add new "Activity type" and it will be "Activity" .
The functionality is the same as an "activity", but executing JS code over previous building blocks and the microflow wait for the execution of this JS and when it return output ,it can be used in the next building blocks. This will be of great help for the developers.
I prefer the way this is done in eclipse.